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Yes, call Cary. They actually have techs available to speak with. Remarkable in this day and age. Having said that, the LEDs are not the most reliable way to bias the amp. If you really want to do it right get a meter. My experience is that the LEDs are not accurate on their own. It's fine in a pinch, but the meter will really allow you to optimize the biasing.
Bias the tubes @ 238mV the LED's just show that the tubes are ok. 1 or 2 degrees of a turn on the adjustments can make a hell of a difference. I have a meter that you can have if you need. I had a V12R and when you bias them right they are a hell of an amp. Best of luck. If you need a tech at Cary, they are there from 1-4 est.